円山川水系(兵庫県)の水生生物群集II : 八木川の淵の底生昆虫

概要

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1. The present paper deals with the ecology of benthic insects living in pools of the River Yagi, which represents the upper course of the Maruyama River system. In the summer of 1957,I surveyed four pools in this river, the depths and the lengths of which ranged between 1.5〜3.5m and 13〜56m respectively. The topography of the pools and the result of collection are shown in Figs. 1〜4 and Tables 1〜5. 2. On the bottom of these pools, mayfly nymphs such as Ecdyonurus yoshidae, Potamanthus Kamonis, and chironomid larvae are the dominant species constituting the benthic insect community (Table 6). The dominant species of the pools differ widely from those of rapids (Table 8). 3. The dominant species of the deep bottom are the best indicators of the characteristics of the pools. 4. The standing crop in the deep bottom is the most scanty comparing with that of other parts in a pool (Table 7). 5. The standing crops of the surveyed pools ranged between 1.9 to 4.0 g per m^2,and these values represented 11 to 37 per cent of the standing crops of the rapids discharging into these pools. These values are shown in Tables 9 and 10.
日本生態学会の論文
1958-10-30